Telephone-receiver.



Patented Nov. l2, I901.

'w. F. TAYLOR. TELEPHONE RECEIVER.

(Application filed Apr. 25, 1901.)

(No Model.)

UNITED STATES WALTER F. TAYLOR, or BROOKLINE, MASSACHUSETTS, ASSIGNOR TOHOLTZER OABOT ELECTRIC OHUSETTS.

COMPANY, A CORPORATION OF MASSA- TELEPHONE-RECEIVER.

SPECIFICATION forming part of Letters Patent No. 686,488, dated.November 12,1901.

Application filed April 25, 1901. Serial No. 57,363. (No model.)

T0 ctZZ whom it may concern:

Be it known that I, WALTER F. TAYLOR, a citizen of Canada, residing inBrookline, county of Norfolk, and State of Massachusetts, have inventedan Improvement in Telephone-Receivers, of which the followingdescription, in connection with the accompanying drawings, is aspecification, like letters on the drawings representing like parts.

The present invention relates to a tele' phone-receiver, and is mainlyembodied in novel features of construction and arrangement whereby themagnet-poles can be easily and delicately adjusted with relation to thediaphragm, further features of the invention consistin gin a novelconstruction of said polepieces whereby a better distribution of themagnetic field is obtained and in novel means for fastening the outsideterminals to the terminals of the electromagnetic coils in the receiver.

Figure 1 is a longitudinal section of a receiver embodying theinvention; Fig. 2, a similar section of the outer shell alone; Fig. 3, aview, partly in section and partly in elevation, of the magnet and itsconnections apart from the shell; Fig. 4, an end View of the receiverwith the earpiece and diaphragm removed; Fig. 5, an end view of thereceivershell alone; Fig. 6, a View of the opposite end of the receiverfrom which the magnet is supported, and Fig. 7 a detail in section ofthe means for connecting the outer terminals with the terminals of themagnet-coils.

In accordance with the invention the magnet (1 is clamped, as by a screwa to a cupshaped base member I), which surrounds and incloses the rearend of the receiver-shell c,

the said member I) being rotatable with rela-- tion to said shell andnot directly fastened thereto. To adjustthe magnet endwise with relationto the diaphragm d, which is held in place in the usual way by means ofthe earpiece e, the magnet is provided at its upper end with asupporting-plate a having a series of inclined surfaces which fit overand.

receiver-shell c, as best shown in Figs. 2 and o. By rotating themagnet-supporting member 19, therefore, with relation to the shell theplate a will travel along the inclined surfaces 0 thus moving the magneta longitudinally with relation to the receiver-shell and varying thedistance between the pole-pieces a and the diaphragm d.

In order to lock the magnet after the proper adjustment has beenattained, the plate a is shown as provided with slots 01., through whichextend screws a, which are threaded in the surface of the annularshoulder upon which the plate a rests. The slots a as shown in Fig. 4,are of sufficient length to permit so much rotary movement of the magneta as may be necessary to effect the desired adjustment.

The terminals of the electromagnetic coils a are connected with rods awhich extend upward from screws f which in conjunction with screws fsecure in position the plates f,

. to which the outside terminals 9 are arranged to be connected, thescrews f being in electrical contact with said plates.

To insure a good electrical connection between the terminals g and thereceiver-conductors a the plates fare shown as provided withsocket-pieces f having oppositely-disposed openings for the terminals g,and within said sockets are placed blocks f having openings in line withthe openings 1", and threaded stems f which extend through suitableopenings in the ends of the sockets and are provided with nuts f Eachterminal g is passed through the three openings, as shown in Fig. 7, andupon tightening the nut f is drawn into'close electrical contact withthe walls of the socket f thus insuring not only a firm mechanicalconnection, but a good electrical connection.

For the better distribution of the magnetic field the pole-pieces a ofthe permanent magnet, around which are wound the coils a are shaped, asbest shown in Fig. 4:, so that together they approximate a circularoutline, the inner sides of the said pole-pieces being substantiallystraight and parallel to'each other and the outer sides being convex.

I claim 1. In a telephone-receiver, the combination with the shelladapted to support the dia phragm; of a shoulder formed in said shelland provided with a series of inclined surfaces; a magnet provided witha supporting member or plate having inclined surfaces adapted to restupon the corresponding surfaces in the shell; and means for locking thesaid magnet when the said plate is in any desired position relative tosaid inclined surfaces, as set forth.

2. In a telephone-receiver, the combination with the shell; of themagnet connected at one end with a cup shaped base member which closesthe end of the shell and is rotatable with relation thereto and at theother end with an annular plate having a series I of inclined surfaces;an annular shoulder formed in the interior of the shell and providedwith inclined surfaces corresponding to those of the plate and adaptedto receive the said plate; and fastening devices whereby said plate maybe secured to or released from said shoulders, as set forth.

3. In a telephone-receiver the combination with the shell; of the magnetconnected at one end with a base member which closes the end of theshell, and at the other end an annular plate having a series of inclinedsurfaces, said magnet having two pole-pieces to receive the coils, theadjacent surfaces of said pole-pieces being substantially straight andparallel to each other, and the non-adjacent surfaces being convex; andan annular shoulder formed in the interior of the shell and providedwith inclined surfaces corresponding to those of the plate and adaptedto receive the said plate, as set forth.

4. In a telephone-receiver, the combination with the shell; of themagnet connected at one end with a base member which closes the end ofthe shell, and at the other end with an annular plate having a series ofinclined surfaces; an annular shoulder formed in the interior of theshell and provided with inclined surfaces corresponding to those of theplate and adapted to receive the said plate; coilterminals connectedwith socket-pieces fastened to said base member; openings in theopposite walls of said socket-pieces in alinement with each other;blocks movable in said socket-pieces and provided with correspondingopenings; threaded stems for the said blocks projecting through suitableopenings in the sockets; and nuts on said threaded stems, substantiallyas described.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

VVAIIIER F. TAYLOR.

Witnesses:

HENRY J. LIVERMORE, NANCY P. FORD.

